I am currently trying to work this out myself,
I have a Prepaid SIM from ATT I use in my Blackberry at times and put it in my Electrify and it will not work, USCC does not lock their world Blackberry SIM card slots,
it says no signal however it will receive text messages but you can't text out or call out.
I may have to try and root it, I have read on some HTC models the SW does something the the modem used for communication and turns it off for GSM, but I have no way of confirming this.
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